macros/macros2.rs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72

// Make me compile! Scroll down for hints :)

fn main() {
    my_macro!();
}

macro_rules! my_macro {
    () => {
        println!("Check out my macro!");
    };
}


// Macros don't quite play by the same rules as the rest of Rust, in terms of
// what's available where.


// Unlike other things in Rust, the order of "where you define a macro" versus
// "where you use it" actually matters.